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On September 15, 2008, the Florida Department of Transportation (FDOT) launched Variable Speed Limits on a stretch of I-4 from Orange Blossom Trail to Maitland Boulevard. This tool is designed to help move traffic more safely and efficiently through congested areas giving drivers a smarter pace on I-4. The speed limit signs now feature flashing amber lights to alert motorists of the changing speed limit.
What are Variable Speed Limits?
Variable Speed Limits is a traffic management tool FDOT uses to create optimum speed limits for current traffic conditions. By considering multiple factors, FDOT can decrease or increase I-4 speed limits displayed on digital speed limit signs. By changing speed limits according to traffic conditions, FDOT can create a smarter pace to maximize traffic flow through congested areas and improve overall roadway safety.
FDOT Traffic Operations Engineer Rick Morrow Demonstrates the Principle
Behind Variable Speed Limits
What Causes Traffic Congestion and Back-Ups?
Congestion on I-4 occurs when there are more cars on the road than the highway can handle. Most commuters can anticipate when and where they are most likely to see congestion on I-4, such as during rush hour, at major entrance or exit ramps, during or immediately after severe weather, or in construction areas. Even when a motorist carefully plans his or her drive, it is impossible to completely avoid traffic delays and congestion. Various factors, such as auto accidents, emergency vehicles, or distracted drivers can also contribute to when and where traffic delays occur.
What Happens When Traffic Slows Down?
When a driver encounters unexpected disruptions in traffic flow, the natural instinct is to brake abruptly. This sudden braking will cause other drivers behind them to do the same and this succession of braking can continue for several miles. When roadway conditions improve, he or she will then accelerate suddenly until reaching another area of congestion. All of this stopping and starting causes an “accordion effect", disrupting the regular traffic pattern.
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